A/C not working!

[Scallywag]

My A/C used to work great. Last winter, I had some work done on it and ever since the A/C blows hot air. I put a can of Freon in it and it worked for about 10 minutes. Then I put dye in it to find the leak. I searched the entire engine compartment with the uv light and couldn’t see anything. There’s no evidence of any leak in the dash area either.
Any ideas?

 

[JKP]

The evaporator in the HVAC box.

 

[macleanflood]

What's your high side/low side pressures and can the system hold vacuum?

-Mac

 

[JKP]

Also, use a refrigerant sniffer in the vents.

 

[Deputy Dodge]

Different dyes glow at different wavelengths. If you don't have the right light you may not see anything. If there was air in the system and you added refrigerant then you now have acid in the system. Find the leak and do a proper repair before this gets super expensive.